Transparent polymer film and method for producing it, and retardation film, polarizer and liquid crystal display device comprising the film
a technology of transparent polymer film and retardation film, which is applied in the direction of polarising elements, instruments, other domestic objects, etc., can solve the problems of reducing producibility, difficulty in adjusting the production process, and affecting the quality of the product, etc., and achieves excellent retardation film, suitable moisture permeability, and suitable moisture permeability.
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[0166]Methods for measuring and evaluating the characteristics as referred to in the following Examples are described.
[Retardation]
[0167]Samples of 5 cm×5 cm are cut out from a film to be analyzed, and tested according to the methods mentioned above. The data at different points are averaged to obtain Re and Rth, the slow axis direction, the fluctuation in Re and Rth, and the fluctuation in the slow axis direction.
[Moisture Permeability]
[0168]The value determined according to the method mentioned above is calculated in terms of the film having a thickness of 80 μm.
[Tg]
[0169]The value determined according to the method mentioned above is Tg of the film analyzed.
[Polarization]
[0170]Two sheets of the polarizer produced herein are stuck together with their absorption axes kept in parallel to each other and the transmittance (Tp) thereof is measured; and they are stuck together with their absorption axes kept perpendicular to each other and the transmittance (Tc) thereof is measured. Th...
examples 101 to 111
, Comparative Examples 101 to 106
(Preparation of Polymer Solution)
1) Polymer:
[0172]In Examples and Comparative Examples, a polymer A mentioned below was used. The polymer A was heated and dried at 120° C. to have a reduced water content of at most 0.5% by mass, and 20 parts by mass of the polymer A was used herein.
Polymer A:
[0173]The polymer A is a powder of cellulose acetate having a substitution degree of 2.85. The viscosity-average polymerization degree of the polymer A was 300; the substitution degree of 6-acetyl group thereof was 0.89; the acetone extract fraction thereof was 7% by mass; the ratio of weight-average molecular weight / number-average molecular weight thereof was 2.3; the water content thereof was 0.2% by mass; the viscosity thereof in 6 mas. % dichloromethane solution was 305 mPa·s; the amount of the residual acetic acid therein was at most 0.1% by mass; the Ca content thereof was 65 ppm; the Mg content thereof was 26 ppm; the iron content thereof was 0.8 ppm; the ...
example 112
[0198]A film having Re=172 nm and Rth=−75 nm was obtained in the same manner as in Example 104, for which, however, the heat-treatment step in Example 104 was changed as follows:
(Heat Treatment)
[0199]The obtained transparent film was heat-treated, using an apparatus with a heating zone controlled at 240° C. between two nip rolls. The draw ratio was controlled to be 30% by controlling the peripheral speed of the nip rolls, and the aspect ratio (distance between nip rolls / base width) was controlled to be 3.3. After stretched, the film was cooled and wound up.
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